3x+7x-40=-20

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Solution for 3x+7x-40=-20 equation: 



3x+7x-40=-20

We move all terms to the left:

3x+7x-40-(-20)=0

We add all the numbers together, and all the variables

10x-20=0

We move all terms containing x to the left, all other terms to the right

10x=20

x=20/10

x=2

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